Method of and device for collecting dust and fly, particularly in textile factories, as spinning mills



March 21, 1939. H, HESS METHOD OF AND. DEVICE FOR 0 ECTING DUST AND FLY, PART IN TEXTILE FACTORIES, AS SPINNING MILLS Filed June 29, 1957 Patented Mar. 21, 1939 UNITED STATES PATENT OFFICE METHOD OF AND DEVICE FOR COLLECTING DUST AND FLY, PARTICULARLY IN TEX- TILE FACTORIES, AS SPINNING MILLS Application June 29, 1937, Serial No. 151,002 In Germany July 1, 1936 2 Claims.

This invention relates to methods of and devices for collecting dust and fly particularly in textile factories, as spinning mills.

The method according to the invention is distinguished by starting to carry off the dust and fly particularly in the immediate vicinity of the places of development thereof by application of electrostatically charged bodies.

This provision permits of concomitantly re- 19 moving dust and fly, in an advantageous manner, from their places of development in which way the disadvantages otherwise arising (for example, soiling the machines, molesting the attendants or impairing the goods produced, as the 15 case may be) are avoided.

By means of the method according to the invention dust and fly can be started to be carried off at the places of development thereof by action of an air current and be passed to electro- 20 statically charged bodies, or bodies adapted to be electrostatically charged can be arranged in the immediate vicinity of the places of development of dust and fly, or both of these modes of procedure can be applied to one and the same 25 source of development of dust and fly. In any case, rollers may be used as bodies adapted for being electrostatically charged which can be rendered operative, advantageously, by rotating the same by means of the working tool to which such 30 rollers are applied whereby a separate or additional source of power may be dispensed with. Advantageously, rollers are used which are made of materials, as glass, ebonite, press material etc., that are susceptible to electrostatic charging.

5 For improving the capacity of the rollers for collecting the foreign matter it is advisable to cover the rollers with a lagging known per se, as cloth, felt, plush, velvet or the like. The charging of the rollers with static electricity may, however,

40 also be effected by means of a separate source of electric current.

The accompanying drawing serves for explaining the manner in which the invention as applied by way of example to a drawing frame is carried 45 into effect with the aid of rollers adapted to be electrostatically charged and to some extent also by means of a gaseous medium. In the drawing Fig. 1 shows a schematic elevation partly in section of means for carrying the method ac- 50 cording to the invention into effect,

Fig. 2 is an axial section of one of the abovementioned roller-shaped bodies, and Fig. 3 is a view similar to Fig. 1 showing modified means for carrying the method according 65 to the invention into effect.

Referring to Fig. l, the side shields of the drawing frame are designated by A. Numerals l, 2 and 3 denote the fluted rollers against which bear the top rollers 4, 5 and 6. Numeral 1 refers to the spinning material, as cotton, wool or the like, which passes in a fleece between the fluted rollers and the top rollers in the direction of arrow 1a. The fluted rollers 2, 3 are journaled in bearing pockets B of the shields A and are maintained clean by a clearer roller 8, which is journaled in bearings C provided on the shields A. The rollers l, 5 which are guided with their journals in a like manner as the top roller 6 in guide slots D of the shields A are maintained clean by a clearer roller 9, whilst the fluted roller I which is also journaled in bearing pockets B is cleaned by a clearer roller l0 which in turn is journaled in bearings C on the shields A. The clearer rollers 8, 9 and I8, which turn together with the associated fluted and top rollers respectively, are hollow and are made of a material permitting to be readily electrostatically charged.

To the outer circumference of the clearer roller 8 a friction rubbing element H is correlated,

which is carried on a frame bracket E and the outer surface of which has a curvature corresponding to that of the said roller circumference and is provided with a lagging E2 of felt, leather or the like, the rubbing element I! being forced into slight bearing engagement with the roller 8 by suitable means (not shown).

In the interior of the rollers 9 and I ii a rubbing element [3, consisting of an adequately heavy material, is stationarily arranged, the rubbing element provided on its surface curved in conformity with the corresponding roller with a lagging M of felt, leather or the like. The rubbing elements 13 bear against the respective rollers by means of their laggings by action of their own weight. In the exit of the drawing frame,

a further roller l5, a so-called fancy stripper, is mounted in a frame bracket F. The roller I5 is of similar construction as the clearer rollers and is provided, similarly as the rollers 9, ll], with an inner freely engaging rubbing element I3 having a lagging l4.

During the operation of the drawing frame, as effected by external power in usual manner, the rollers 2, 3 turn clockwise and the rollers 4, 5 and 6 anticlockwise, as indicated by the respective arrows. The clearer rollers 8, 9 and ID are turned by frictional circumferential engagement with these rollers in the directions indicated for each of the clearer rollers by a further arrow, 5

whereas the clearer roller I5 is driven, for example, through the intermediary of a flexible endless driving means I5a, by the roller I, in a direction as indicated by the respective arrow. By effect of the turning movements of the clearer rollers during rotation of the rollers 8 to I0 and I5 static electricity is generated by the correlated rubbing elements.

The four rollers 8, 9, it and I5 are each provided at the two face ends with a flanged limiting wall E6 of a material which insulates against electricity, as shown in Fig. 2 for roller I0. The limiting walls It of these rollers are each provided with a central journal pin H for inserting the rollers in suitable bearings as indicated at C.

During the operation a time-lag sets up between the pairs of elements 3, 6 and 2, 5 as well as I, 4 of the drawing frame, whereby the spinning material 'i is expanded. Incidental thereto individual fibres fly oh the spinning material away from the drawing field and at the same time dust and other impurities separate out. These separated particles are attracted and retained within the drawing frame by the circumference of the nearest roller 8, 9 or iii which have been electrostatically charged by effect of the drive imparted to the drawing frame. Also fly and dust having already passed out of the drawing frame at the delivery end thereof return to the rollers 9, I0 or are attracted and retained by the roller I5; Threads that may have been torn are immediately wound on the fancy stripper I5.

Clearer plates or clearer pallets may be used as electrostatically charged bodies instead of rollers, driving such bodies being dispensable by actuating correlated rubbing elements which serve for producing the electrostatic charging, if desired, by action of the moving drawing frame or else in such manner that rubbers of this kind are arranged directly on moving elements of the drawing frame.

In the modification shown in Fig. 3, means are provided for removing dust and fly by an air current in combination with means of the kind described above.

The drawing frame to which the modified impurity removing means are applied comprises also in this case fluted rollers I, 2 and 3' and top rollers 4, 5 and 5 all of which are mounted between the side shields A. The top rollers 4, 5 are again cleaned by a clearer roller 9 associated with a rubbing element I3, whereas the fluted rollers I, 2 are cleaned by means of a horizontal pressure cylinder I8 cooperating with a clearer roller 8 which is correlated to the roller 3' and has a relatively large circumferential area. The roller 3 is mounted in bearings, (not shown) substantially similar to bearings C of Fig. 1, arranged on the side shields A and frictionally engages with the circumference of the roller 3. On the other hand, the circumference of the clearer roller 8' is frictionally engaged by a rubbing element 1 I stationarily mounted on a frame bracket E.

The pressure cylinder I8, which is fixed underneath the roller I and is provided with an elongated nozzle I9 extending parallel with the axis of the cylinder across the shell of the latter, is supplied with compressed air, through a pipe connection 253'. The nozzle I9 is so arranged near the top of the cylinder I8 on the side of the latter facing the clearer roller 8 that the current of air emanating from the nozzle during the operation of the drawing frame flows substantially horizontally across the undersides of the fluted rollers i, 2 over to the clearer roller 8 as indicated by arrows ZI. At the same time-the rollers I to E and 8, 9 rotate in the directions as indicated by the respective arrows, so that static electricity is generated at the rubbing elements II and I3. Consequently the rollers 8 and 9' are electrostatically charged, as explained above. Alternatively, the electrostatic charging of the roller 8 may be effected with the aid of a rubbing element arranged in the hollow interior of the roller, and, instead of a roller an electrostatically charged plate or the like may be provided.

The foreign matter adhering to the circumferences of the rollers I, 2 is carried off by the air current 2I' and is attracted by the electrostatically charged surface of the roller 8, when the air current comes within the range of operation of this surface, and is then attracted and retained by the latter.

It is also feasible to employ rollers, plates or similar bodies which are electrostatically charged by a separate source of electricity in such manner that an attractive power obtains as required for the intended purpose.

I do not limit myself to the particular size,

shape, number or arrangement of parts as shown and described, all of which may be varied without going beyond the scope of my invention as shown, described and claimed.

What I claim is:

1. Method of precipitating dust and flying particles in drawing machines comprising electrostatically charging a cleaning roller contacting the periphery of a drawing roller of the drawing machine and driven thereby, so that the dust and flying particles are attracted and retained, directly 4 adjacent a point at which they arise, and blowing dust and flying fibers from other points of the drawing machine at which they arise into the effective field of the electrostatically charged cleaning roller. f

2. Arrangement for collecting dust and flying fibers from textile drawing machines having rollers, and like machines, comprising a cleaning roller of a material which is readily charged electrostatically, said cleaning roller contacting a roller of the drawing machine or the like, a rubbing element contacting said cleaning roller to charge it electrostatically, and means for directing air currents from other portions of the draw ing machine into the vicinity of the cleaning ,2;

roller, so that said cleaning roller electrostatically attracts and retains flying dust and fibers directly at the location where said flying material if caused.

OTTO HEINRICH HESS. 

